INHERITANCE2.CS

using System;

class Shape {
  protected int length;
  public Shape() { //default constructor
    Console.WriteLine("Shape's default constructor");
  }
  public Shape(int length) { //constructor with parameters
    this.length = length;
    Console.WriteLine("Shape's constructor with 1 parameter");
    Console.WriteLine(this.length);
  }
}

class Square: Shape {
  public Square(): base() { //calling Shape class default constructor using base
    Console.WriteLine("Square's default constructor");
  }
  public Square(int length): base(length) { //calling Shape class constructor with parameters using base
    Console.WriteLine("Sqaure's constructor with 1 parameter");
    Console.WriteLine(this.length);
  }
  public int get_Area(){ return (length * length); } //method computing area of square
}

class Program {
  static void Main() {
    Square sq1 = new Square(); //making object of child class Sqaure
    Square sq2 = new Square(5); //setting length equal to 5
    Console.WriteLine("Area of sq1 is: {0}",sq1.get_Area());
    Console.WriteLine("Area of sq2 is: {0}",sq2.get_Area());
  }
}